Citation: Kui Lin Deng, Tao Yi Zhang, Xiao Jing Zhang, Ping Xie, Rong Ben Zhang. H-bonding template-directed synthesis of a complete m-PDA-bridged ladder polyhydrosiloxane (OLPHS)[J]. Chinese Chemical Letters, ;2007, 18(7): 779-782. doi: 10.1016/j.cclet.2007.05.037 shu

H-bonding template-directed synthesis of a complete m-PDA-bridged ladder polyhydrosiloxane (OLPHS)

a State Key Laboratory on Polymer Physics & Chemistry, Joint Laboratory of Polymer Science & Materials, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100080, China;
b Graduate School of the Chinese Academy of Sciences, Beijing 100039, China;
c College of Chemistry & Environmental Science, Hebei University, Baoding 071002, China

Received Date: 26 February 2007

Fund Project: This work was financially supported by the NNSFC (No. 50073028, 29974036, 20174047).

A highly ordered m-phenylenediimino-bridged ladder polyhydrosiloxane (abbr. OLPHS) with M_n=1.24×10⁴ was synthesized stoichiometric hydrolysis and dehydrochlorination condensation reaction between Si-Cl and Si-OH bonds. The complete ladder structure of OLPHS has been confirmed by the following three data. Two characteristic Bragg's peaks representing the ladder width (w=0.94 nm) and ladder thickness (t=0.42 nm) were observed in XRD analysis, which are consistent with those calculated by molecular simulation. The very sharp absorption with a small half-peak width (w_1/2=0.5 ppm) for [(-HN)HSiO_2/2]_n moiety of OLPHS in ²⁹Si NMR spectrum indicated presence of the complete ladder structure. As collateral evidence, a higher glass transition temperature (T_g=105℃) is also recorded in the DSC measurement, implying the high stiffness of ladder chain of OLPHS.
- H-bonding template,
- Ladder polysiloxane,
- Self-assembly,
- Stepwise coupling/polymerization
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